Gridshape now using internal mesh and jit.gl.material questions

I’ve read somewhere that with max6 jit.gl.gridshape is using a mesh internally.

So My questions are:
- Is that the case only with gridshape or with jit.gl.model / nurbs / sketch… aswel?
- Is there a way to access the tangents (or other vertex attributes) in a shader? A similar way one would do it with the original jit.gl.mesh object?

- And: As jit.gl.material generates its own shader is there a way to use the object with ones self-made shader? Would there be any benefit? Easy texture-storing for example?